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Amniotic Fluid

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Lacking a skin barrier, the fetus at mid-pregnancy may come in direct contact with high concentrations of cocaine in amniotic fluid, a reservoir that clears cocaine slowly, thereby prolonging exposure during critical periods of fetal neurotransmitter formation [7].

The mean thyroxine and 3,3',5-tri-iodothyronine levels in amniotic fluid were much lower and the mean 3,3'5'-tri-iodothyronine much higher than the corresponding values in maternal serum at both 15 to 19 and 36 to 42 weeks of pregnancy [14].

Prostanoid [prostaglandin (PG)] concentrations were measured in ovine maternal and fetal plasma and amniotic fluid during the onset of preterm labor induced by the administration of a pulsatile infusion of ACTH-(1-24) (P-ACTH; 66.7 ng/min for 15 min every 2 h) to the fetus and in saline-infused controls [19].

This phenotype was associated with elevated free estrogen levels systemically and in the amniotic fluid, increased tissue factor expression in the placenta and heightened platelet sensitivity to agonist-induced activation ex vivo [21].

Delivery of Ad2/CMV-beta Gal to the amniotic fluid in mice produced intense transgene expression in the fetal epidermis and amniotic membranes, some gastrointestinal expression, but no significant airway epithelial expression [22].

During ontogeny, its activity parallels the development of T cell reactivity, i.e., it is absent both in the amniotic fluid and in sera of unborn mice, but increases to high levels during the early postnatal phase [25].

Mechanisms by which this may have occurred were temporary suppression of GBS vaginal and rectal colonization, high concentration of ampicillin in the amniotic fluid, and transplacental transport of the antibiotic to the infant [30].

Although supraphysiologic concentrations of PRL were achieved in plasma and amniotic fluid, there was no effect of this treatment on the flux of tracheal fluid surfactant or on plasma concentrations of corticoids of dehydroepiandrosteronesulfate[31].

We report here that a pure preparation of the extracellular form of the IGF binding protein (purified from human amniotic fluid) markedly potentiated replication of several cell types in response to human IGF-I[33].